add new data source type: app #487

Job	Run time
event-file	4s
build (./gradlew build -x :metadata-ingestion:build -x :metadata-ingestion:check -x docs-website:...	15m 30s
build (./gradlew build -x :metadata-ingestion:build -x :metadata-ingestion:check -x docs-website:...	12m 38s
build (./gradlew :datahub-frontend:build :datahub-web-react:build --parallel, UTC)	22m 14s
build (./gradlew :datahub-frontend:build :datahub-web-react:build --parallel, America/New_York)	18m 30s
build (./gradlew :metadata-ingestion-modules:airflow-plugin:build --parallel, UTC)	6m 18s
quickstart-compose-validation	18s
build (./gradlew :metadata-ingestion-modules:airflow-plugin:build --parallel, America/New_York)	5m 5s
Git Repo Sync	21s
	1h 20m 58s

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